Please can you help me with this question???

Ollies Inc. started operations on January 1, 2020. It originally applied weighted-average cost-flow assumption for inventory accounting. However, after studying the actual, physical flow of its products, the companys management concluded that FIFO is the preferred method and it applied the FIFO method as of January 1, 2022 (i.e., 2022 is the year of the change). The average cost method is still used for income tax purposes.

The companys income statements (under weighted-average inventory accounting method) for fiscal years ended December 31, 2021 and December 31, 2020 are presented below

	2021	2020
Sales	600	500
Cost of sales	350	275
Gross profit	250	225
Selling and administrative expenses	90	80
Profit before tax	160	145
Taxes	48	44
Net income	112	102

Under the average cost method, the companys inventories amounted to $25 million and $30 million at the end of 2020 and 2021 respectively.

The companys cost of goods sold under FIFO would have been $260 million and $330 million in 2020 and 2021 respectively. Also under the FIFO method, sales, cost of goods sold (COGS) and selling and general expenditures for 2022 are $700 million, $410 million and $120 million respectively.

The company is subject to a 30% tax rate.

Required:

1. Prepare the comparative income statements for Ollies Inc. for the three year period 2020 to 2022 after the change to FIFO.
2. Determine the after-tax cumulative effect in retained earnings at January 1, 2022.
3. Prepare the journal entry on January 1, 2022 for the change in accounting principle.